New 12v dead after one month

[chriserx]

Here’s the video when I jumped it. It starts out at 3.8V then I attached another 12V through my jumper leads (jumps to 12V) then I got in and turned the truck on (jumps to 13.4V). I ended up taking the battery out and charging it alone with the 5A Noco as it couldn’t do it attached. It took it 10+ hrs and it was hot (Noco) the entire time but the battery got to 12V and stayed. I drove it around yesterday, had it parked for several hrs at a time, and when I reconnected the Noco it’s able to charge it to green. I turned automatic updates off in the truck. If this seems to work I’m going to turn AU back on and use the breaker that is on the amp to disconnect it and see if it behaves any different.

You really should get that battery tested, no matter how new.
If battery was 3v, you jump started and voltage read 13+ that should rule out DCDC failure, though it could still be intermittent.
You likely could test if it's the amp with a volt meter, it may be somewhat unreliable because there are variables like welcome lighting and approach detection but its worth a shot.
Turn off all 12v sources you can just for good measure, open frunk and door where the amp is, let it sit a while, leave keys and phone in the house.
Measure the voltage with the amp plugged in.
Unplug amp, measure again.
If the voltage realistically increases, you've found your problem.

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